What Is The Lub Dub Sound Link

During inspiration, intrathoracic pressure drops, increasing venous return to the right heart. This prolongs right ventricular systole (ejection time), delaying P2. Meanwhile, increased blood pooling in the pulmonary circulation slightly decreases left ventricular filling, shortening left ventricular systole and causing A2 to occur slightly earlier . The result is a wider gap between A2 and P2 during inspiration ( physiological splitting ).

The "lub" marks the beginning of systole, while the "dub" marks the beginning of diastole. what is the lub dub sound

That longer pause is the "resting" time where the heart muscle is relaxing and filling with blood, preparing for the next big squeeze. intrathoracic pressure drops

Unlike S1, S2 is frequently heard as two distinct sounds during inspiration: (aortic) and P2 (pulmonary). delaying P2. Meanwhile